Lead-copper alloy.



UNITED STATES PATENT ens EDWARD D. GLEASONQ'OF NEW YORK, N. Y., ASSIGNOR. BY MESNE ASSIGNMENTS, TO

PLASTIC METAL COMPANY, INC., OF BROOKLYN, NE! YORK, A CORPORATION OF Patent-ed July 1,1913.

NEW YORK.

LEAD-COPPER ALLOY.

1,0 403, Specification o: Letters Patent.

- No Drawing.

l5 and segregation, which are defects usually found in such alloys due to lack-of alli-nity of the lead for the copper or copper and tin, and the high specific gravity and low 3 melting point of vlead, for, at best,"sucl1' 2" alloys are but mechanical mixtures where-' copper is held in a finely divided state iin'a matrix-ofnlead, f

Another bb'j'ect' of my invention is to'provide such alloys including agiven percentage of copper. but ofjditferent degrees of hardness; 4 r The effectof my improvement is to provide an alloy w ich is homogeneous in that the copper therein is comminuted to the greatest possible extent and equally distributed throughout the mass of the alloy; 7

In practising 'my i mention, I incorporate boronji'n copper'nas graphite exists in cast. iron; such'a b'o ron copper productandwil 3 method. of producing'it being the .subgect f matter of another application Serial 731,863 lfiled November 16, .1912, for Letters" Patent -.of the United States. Such boron copper is harder than ordinary copper and by its 4.0 employmentin varying perc'entages I am ab'leto-niake copperdead alloys which are alike in-totalpercentage of copper but different in degrees of hardness; -For instance, an alloy in accordance with; my invention may contain partslead and 50 parts of boron copper and would be much harder and x'nore brittle than another alloy, in. ac-

cortlance with my invention, containing 50 parts lead and 50 parts of copper if the Appllcetion filed October 2, 1912. Serial No. 723,579.

latter is an aggregate'of ordinary copper and boron copper. In any'case I prefer to roceed by first melting the copper, with suitable appliances, and adding the lead thereto when the copper is in the fluid state, and, then stirring or otherwise agitating the mixture tefore pouring it into ingot molds.

For instance, I take 50 parts of v boron copper, melt it and add thereto 50 parts of lead. The alloy thus produced.

may be called No. 1. In making another alloy I take 50 parts of ordinary commercial copper; melt it, add 50 parts of lead and then add 100 parts of No.13. This 'may be called N0. '2 product andis less hard than No. 1. In "making another alloy I- melt 50 parts of commercial copper and 50 parts lead as in the above procedure and add thereto 100 parts of No, 2, this ro-' duct being, of course, less hard than the.

two previous examples. All of these prodnets are free from lead sweats or segregation and have an unctuousanti-frictional texture and a surface resembling planishcd copper; properties which are advantageous iii-bearings, piston rings, gaskets and steam packing.

In making alloys of copper, lead andtin',

the tin will segregate if not in the. proper proportion for the copper and lead. 'For instance, if copper 67 parts, lead 24 parts and tin 9 parts are mixed, in accordance hardness. For instance I an alloy, in accordance with my invention containing 80 parts lead, 193} parts boron copper and partran timcny, will fuse in an ordinary iron hand ladle at aboutQOO degrees F! but is tough, hard, and equal to a so called Babbittrnet-al. This alloy is well adaptcdfor the manufacture of die castings, made under pressure.

I do not desire to limit myself to the VlZ., castings Y prcciw methods of procedure or proportions In testimony whereof, I have hcrcuntu 110mm 5% fort-h it is obvmus that VHIIOHS slgncd my namq at Phdadglphm, Pennhyl- 10 mod lficatlons may be made thereln without- \anm, tlns thu'tlcth day of September, 1912.

departing from my invention as defined in 'FDVARD D GI E \%()N S-the appended claim. j d J I clain1: "itnesscs:

GFRTRUDE N. R; MA'rrsuN,

An alloy containing lead, copper and ANNA ISRAELVL'IZ.

l boron. i 

